You are seeing a 33-year-old male in a GP setting who has presented with a discomfort in the scrotal area. The patient reports to you that he is not in pain but there is a strange dragging sensation in this area. The patient also reports to you that he noticed this around 2 months ago. On examination, it is not possible for you to get above the swelling and there is a positive cough impulse. What is the most likely diagnosis?